It is now a centre of the tunny fishery, and there are manganese mines also.
Wine, fruit, cork, baskets and sumach are exported in small coasting vessels; there are important sardine and tunny fisheries; and boats, sails and cordage are manufactured.
Among the fish may be mentioned the tunny, dolphin, mackerel, sardine, sea-bream, dentice and pagnell; wrasse, of exquisite rainbow hue and good for food; members of the herring family, sardines, anchovies, flying-fish, sea-pike; a few representatives of the cod family, and some flat fish; soles (very rare); Cernus which grows to large size; several species of grey and red mullet; eleven species of Triglidae, including the beautiful flying gurnard whose colours rival the angel-fish of the West Indies; and eighteen species of mackerel, all migratory.
Cod, bream, tunny and anchovy are the principal fish taken.
Pietro, forms a more or less protected basin, upon the shores of which are several small harbours (the most important being Carloforte), which are centres of the export of minerals and of the tunny fishery.